At the start of the 20th century, Europe was sitting on a bunch of bombs that only needed one spark to go off. In Europe, things had been going so badly for the past fifty years that peace could no longer be kept. Every country in Europe was competing to get better weapons. Things that were not pleasant, like the Franco-Prussian War, Berlin Congress, Bulgarian Question, the birth of the Triple Alliance, the Russo-German Dispute, the Naval Competition between England and Germany, the Bulgarian Question, the spirit of Imperialism, the Morocco Crisis, the Serajevo murder, and many other things.

Europe was split into two unfriendly groups by this point.

First group: England, France, Russia, Serbia, Japan, Portugal, Italy, the United States, Romania, Greece, Siam, Siberia, Cuba, Panama, Brazil, Guatemala, Nicaragua, Costa Rica,

Second Group: Germany, Austria, Hungary, Bulgaria, and Turkey were in the other group of Central Powers.

when did ww1 start?
The murder of Archduke Franz Ferdinand on June 28, 1914, set off a war between Austria and Serbia that slowly turned into a world war. Almost every country and race in the world took part in this war.

More Info Click Here